Allow at least a 2-second gap between you and the vehicle in front on roads carrying faster-moving traffic. Double this on wet roads.
So how can you tell a safe traveling distance when driving?
I use the saying "only a fool breaks the 2-second rule" pick a landmark in front of you. when the vehicle in front passes it say to yourself "only a fool breaks the 2-second rule" if you have passed the landmark before you finish the saying you are too close.